Messages staying in outbox

[M42]

Just discovered that any pm's I try to send, says it's sent but they just go direct to my outbox and stay there. Never happened before, just recently. Any ideas?

[masd]

Was happening to me recently, however after doing some research I think the messages stay in your outbox until the recipient reads them. I may be wrong.

[jmc330i]

I think the messages stay in your outbox until the recipient reads them.

^^^ This.
Once the message is read it will appear in your sentbox. Keep in mind that if the recipient has email notifications and reads the PM in their email, the message won't appear in your sentbox.

[M42]

Thanks guys. Makes more sense now. Thought, once you click send, then it's sent.